arch/arm64/lib/tishift.S

Source file repositories/reference/linux-study-clean/arch/arm64/lib/tishift.S

File Facts

System
Linux kernel
Corpus path
arch/arm64/lib/tishift.S
Extension
.S
Size
1054 bytes
Lines
75
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/linkage.h>

#include <asm/assembler.h>

SYM_FUNC_START(__ashlti3)
	cbz	x2, 1f
	mov	x3, #64
	sub	x3, x3, x2
	cmp	x3, #0
	b.le	2f
	lsl	x1, x1, x2
	lsr	x3, x0, x3
	lsl	x2, x0, x2
	orr	x1, x1, x3
	mov	x0, x2
1:
	ret
2:
	neg	w1, w3
	mov	x2, #0
	lsl	x1, x0, x1
	mov	x0, x2
	ret
SYM_FUNC_END(__ashlti3)
EXPORT_SYMBOL(__ashlti3)

SYM_FUNC_START(__ashrti3)
	cbz	x2, 1f
	mov	x3, #64
	sub	x3, x3, x2
	cmp	x3, #0
	b.le	2f
	lsr	x0, x0, x2
	lsl	x3, x1, x3
	asr	x2, x1, x2
	orr	x0, x0, x3
	mov	x1, x2
1:
	ret
2:
	neg	w0, w3
	asr	x2, x1, #63
	asr	x0, x1, x0
	mov	x1, x2
	ret
SYM_FUNC_END(__ashrti3)
EXPORT_SYMBOL(__ashrti3)

SYM_FUNC_START(__lshrti3)
	cbz	x2, 1f
	mov	x3, #64
	sub	x3, x3, x2
	cmp	x3, #0
	b.le	2f
	lsr	x0, x0, x2
	lsl	x3, x1, x3
	lsr	x2, x1, x2
	orr	x0, x0, x3
	mov	x1, x2
1:
	ret
2:
	neg	w0, w3
	mov	x2, #0
	lsr	x0, x1, x0
	mov	x1, x2
	ret
SYM_FUNC_END(__lshrti3)
EXPORT_SYMBOL(__lshrti3)

Annotation

Implementation Notes